# A018921 (b-file synthesized from sequence entry)
0 4
1 8
2 15
3 28
4 52
5 96
6 177
7 326
8 600
9 1104
10 2031
11 3736
12 6872
13 12640
14 23249
15 42762
16 78652
17 144664
18 266079
19 489396
20 900140
21 1655616
22 3045153
23 5600910
24 10301680